DE3152083C2 - Device for determining the hardening time of binders and core compounds - Google Patents

Abstract

The device comprises a container (4) for the test specimen (5), said container being placed inside a heating furnace (1) provided with a cap (2) and being mounted on a table (3) fixed to the cap (2) of the furnace (1). Electrodes (7) and (8) are located inside the container (4) and are electrically connected through a circuit to a recording instrument for measuring electrophysical parameters between the electrodes (7) and (8), which are connected to each other so that a sealed chamber (9) is formed therebetween. The device comprises as well a guiding stand (10) placed outside the furnace (1) and provided with a cantilever (11) fixed to the cap (2) of the furnace (1) and movable along the stand (10) with the possibility of its fixation and thus providing for a precise setting of the table (3) with the container (4) inside the furnace (1). The device further comprises a mechanism (12) for feeding a gaseous catalyst into the sealed chamber (9) between the electrodes (7) and (8), said mechanism consisting of a pipe (13) connected to a tank (14) for the gaseous catalyst. The guiding stand (10) is provided with a hollow (39) housing inside it the pipe (13) for feeding the gaseous catalyst to the sealed chamber (9) between the electrodes (7) and (8) and electrical wires (40) connecting the electrodes (7) and (8) to the circuit for measuring electrophysical parameters between the electrodes (7) and (8).

Description

50

Field of technology

The present invention relates to the field of foundrying, and more particularly to equipment to determine the hardening time of binders and core compounds.

State of the art

In the foundry practice of the Soviet Union there is a device for determining the hardening time of binders and core masses known that a container placed in a heating furnace with a lid for a sample to be examined, which rests on a table rigidly connected to the furnace lid is In the container electrodes are arranged coaxially, with a recording device via a recording circuit for the measurement of electrophysical parameters / electrically coupled between the electrodes which are connected to one another to form a hermetically sealed space between them. The establishment reveals a display outside the furnace Guide stand with a console, which is rigidly connected to the furnace lid and for precise adjustment of the table with the container and sample in the oven can be fixed and displaced relative to the stand, as well as a device for the supply of gaseous catalyst into the hermetically sealed space between the Electrodes that represent a pipeline connected to a vessel for gaseous catalyst.

The known device is used to determine the hardening time of binders and core materials that are curable with thermal drying, of cold-curing masses and of binders and masses that are curable by blowing through with gaseous catalysts.

Mad Connection with the fact that the V01 ichtung for the Supply of gaseous catalyst, including the pipeline and electrical wires, is in the immediate vicinity Near the heating furnace and in the displacement zone of the moving system that is from the furnace lid, the table, the container with the sample to be examined and the electrodes there is a risk of damage and short-circuiting of the electric wires and damage the pipeline, what the operational safety of the device and the safe operation of the same especially when using toxic catalysts.

Disclosure of the invention

The invention is based on the object of a device for determining the hardening time of binders and to create core masses in which the construction of the guide stand as well as the accommodation the conveying line for the supply of gaseous catalyst in the hermetically sealed space between the electrodes and the electrical coupling of the electrodes with the measuring circuit for measuring electrophysical parameters between the electrodes rs allowed, the reliability and work safety as well as the convenient operation, especially when using to ensure of toxic catalysts.

This task is carried out by means of a device for determining the hardening time of binders and Core masses dissolved, which one in a heating furnace with Lid inserted container for an examine de Prohe. which is placed on a table rigidly connected to the furnace lid and in which electrodes are arranged coaxially with a regulator electrically via a measuring circuit for measuring electrophysical parameters between the electrodes are coupled, which are connected to each other to form a hermetically sealed space between them are, a guide stand set up outside the furnace with a console that connects to the furnace dome rigidly connected and for precise positioning of the table with the container and sample in the oven can be fixed and displaced relative to the stand, and a device for the supply of gaseous catalyst into the hermetically sealed space between the electrodes contains, the one with a vessel for gaseous

Represents the pipe in connection with the catalyst, in which, according to the invention, the guide stand is hollow is formed and in its cavity the pipeline for the supply of gaseous catalyst to the hermetic tight space between the electrodes as well as electrical wires that hold the electrodes connect to the measuring circuit for measuring electrophysical parameters between the electrodes.

Characterized in that the guide stand is hollow and the pipeline for the supply is in its cavity of gaseous catalyst as well as the electrical wires that the electrodes with the measuring circuit for measuring electrophysicals Connect parameters will improve operational reliability. Work safety and comfortable operation, especially when using toxic catalysts guaranteed because of the likelihood of hose and electrical wire breakage at the Displacement of the moving parts of the device decreases.

It also adds convenience in preparing the device for work and in disassembling it increased after the measurement is finished.

When using flexible hoses to connect the pipeline with the hermetically sealed space between the electrodes with the purpose of moving the moving system and especially the electrodes to make possible. as well as to ensure a quick assembly and dismantling of the facility the pipeline for the supply of gaseous catalyst is expediently provided with nozzles which are shown in the wall of the stand in its upper and lower part are attached, the pipeline over the one Stub is connected to the hermetically sealed space between the electrodes. while they talk about the other nozzle by means of a control valve that is connected to the Measuring circuit for measuring electrophysical parameters is electrically coupled to the outside the stand arranged vessel for gaseous catalyst is in connection.

It also has high accuracy and reproducibility of measurement results thanks to the existing control valve that comes with the measurement circuit / ur measurement of electrophysical parameters is electrically coupled and allows the supply to bring about the gaseous catalyst with the synchronous switching on of the recorder.

For the purpose of using the device to determine the hardening time of binders and core compounds, the liquid catalysts are curable, which are supplied to the mass in the vapor state a device for metering liquid catalyst can be installed in the cavity of the guide stand accommodate that with a vessel for liquid catalyst, which is arranged outside of the stand is. is hydraulically connected.

This ensures the possibility of the hardening time of binders and cores to be determined by vaporizable vaporous catalysts, such as B. Triethylamine. are hardenable.

The presence of the dosing device also ensures the increase in the accuracy of the MeUer ^ ebnis ^ e and their reproducibility as well as reliability!;! · .Mgltcii around! safe operation of the facility.

t s is constructively expedient if the device / ur dosing of liquid catalyst a cylinder reveals that it has a piston with a piston rod, which are arranged in its interior and can be moved by a drive, and in the cavity of the Guide tripod is housed with the formation of a hermetically sealed cavity, which has a nozzle and a conduit with a source of carrier gas supply and, via another port, with the hermetic one tight space between the electrodes communicates, wherein in the hermetically sealed cavity a Means for converting the dose of the liquid catalyst supplied from the cylinder into the gaseous one State for further transport by means of carrier gas into the hermetically sealed space between the electrodes is provided, which cylinder alternates either with the vessel for liquid catalyst or with the Means for converting the dose of the liquid catalyst into the gaseous state in connection is, and the device for metering liquid catalyst also has a micrometer screw with head, which the stroke of the Kolhpns with the Piston rod limited.

The construction of the dosing device offers the possibility of high accuracy and reproducibility the dosage. Change in the concentration of the metered catalyst in a wide range, compactness the facility as well as its simplicity and operational reliability.

In order to increase the accuracy of the dosage and the ability to produce measurement results, it is advisable to alternate the connection of the cylinder with the vessel for liquid catalyst and with the means for converting the dose of the liquid catalyst into the gaseous state by means of non-return valves.
It is useful if the hermetically sealed cavity in the guide stand is delimited at the top and bottom by partition walls attached to the wall of the stand, the lower one of which has a recess which fulfills the function of the means for converting the dose of the liquid catalyst into the gaseous state .

Thanks to the presence of a hermetically sealed cavity in the guide stand, the top and bottom is limited by partitions attached to the wall of the stand, of which the lower part has a recess

having the function of the means for converting the dose of the liquid catalyst into the gaseous Condition met, the evaporation process of the liquid catalyst is intensified, the uniformity of Distribution of catalyst vapors in the volume of the carrier gas increases and, as a result, the accuracy and reproducibility of measurement results <_; i increased

It is also possible to install a heating element in the hermetically sealed cavity of the guide stand for

intensification of the process of transferring the dose to arrange the liquid catalyst in the gaseous state.

In the case of using a manual drive for movement the piston rod of the dosing device and to ensure high accuracy and For reproducibility of the dosage, it is useful to have an axial bore in the micrometer screw and in the head run through which the piston rod is guided. which has an annular projection that

t> 5 against the face of the micrometer screw the movement of the piston rod.

Its purpose is to automate the dosing process and simplify the operation of the device

advantageous if the drive of the piston rod with a piston mounted in the cavity of the stand Contains an electromagnet, the core of which is connected to the piston rod? and a feather that bears the The piston presses against the cylinder base.

If an electromagnet is used to drive the piston rod, it is useful if the Mikrome'.screw with head on its stroke on the Acts cylinder and moves the latter in the axial direction. Such a construction of the connection the micrometer screw and the head with the cylinder is the easiest and best to manufacture.

For the simultaneity of the movement of the console relative to the guide stand and the alternating connection of the cylinder with the vessel for liquid catalyst and with the means for transferring the dose of the liquid catalyst in the gaseous state, it is useful if the cylinder with the console is rigidly connected and an axial rotation when the console is moved relative to the guide stand and fixation of its position.

To increase the ease of use and operation and to make the device more compact it is expedient for the stand to be axially displaceable along the heating furnace and fixable with respect to the same to be carried out and provided with a counterweight 2U, that is the mass of the tripod with the console, the lid with the table attached to it, on which the container with the sample to be examined is in place, and with the electrodes arranged in the lid fades.

You can adjust the axial displacement of the stand by means of a cylindrical rigidly connected to the heating furnace Socket in which the stand is arranged, which has a longitudinal groove on its outer surface, and by means of ensure a lock fixed in the socket, the end of which is located in the said longitudinal groove.

Such a construction of the attachment of the tripod prevents its rotation with respect to the longitudinal axis, which in turn secures the hoses from damage and thereby the operational reliability and ease of use the establishment increased.

It is useful if the electrical wires, which are housed within the guide stand, with the measuring circuit for measuring electrophysical Parameters are connected between the electrodes via a limit switch, which is attached under the guide stand and with this at the axial Shifting the tripod cooperates

Thanks to this arrangement of the limit switch, the simultaneous activation of the recorder, the supply of the gaseous catalyst and the activation of the exhaust ventilation at the moment of introduction of the sample in the oven and sealing it with the lid

The electrical wires that are housed inside the guide stand can be checked with the measuring circuit for measuring electrophysical parameters between the electrodes via a limit switch connect, which is attached to the guide stand and with the console when moving the latter interacts relative to the tripod

Such a connection of the electrical wires with the measuring circuit for measuring electrophysical Parameters via the limit switch is immovable in the case of using a relative to the furnace Tripod used

Appropriately, the electrical wires, that are housed inside the tripod Electrodes connected by means of a plug-in device, the bushing of which is attached to the guide stand.

The presence of the connector ensures that the electrodes can be connected and disconnected quickly to the measuring circuit for measuring electrophysical parameters, increases the reliability the measurement and protects the electrical wires from

to damage and short circuit.

Brief description of the drawings

In the following, the present invention is illustrated by the description of an exemplary embodiment on the basis of FIG Drawings explained: in these shows

F i g. 1 shows the general view of the device for determining the hardening time of binders and core compounds in longitudinal section;

Fig. 2 the same with the device for the supply of gaseous catalyst partly in longitudinal section without showing the furnace and electrodes;

F i g. 3 a variant of the device for determining the hardening time of binders and core compounds with the device for metering liquid catalyst partly in longitudinal section without showing Furnace and electrodes;

F i g. 4 shows the general view of the device for metering liquid catalyst with a longitudinal section;

F i g. 5 shows the overall view of the guide stand with a variant of the device for metering liquid Catalytic converter, in which the drive of the piston rod is designed in the form of an electromagnet Longitudinal section;

F i g. 6 shows a variant of the device for determining the hardening time of binders and Core masses in which the guide stand is axially displaceable relative to the furnace in longitudinal section and

F i g. 7 shows the overall view of the device for metering liquid catalyst, which is attached to the movable Mounted tripod and in which the cylinder is rigidly connected to the console with a longitudinal section.

Preferred embodiments

The device for determining the hardening time of binders and core compounds, shown in F i g. 1, contains a heating furnace 1 with a cover 2 and housed in the heating furnace 1: a table 3, which is connected to the Lid 2 of the furnace 1 is rigidly connected, and a container 4 for a sample to be examined 5, which is placed on table 3. In the container 4 there are electrodes 6 arranged coaxially, which is connected to a recording device (not shown in figures) via a (in figures not shown) measuring circuit for measuring electrophysical Parameters are electrically coupled between the electrodes, the outer electrode is designated with 7 and the inner electrode with 8. The electrodes 7 and 8 are hermetic to form a tight space 9 connected between them.

The device also contains a guide stand 10 set up outside the furnace 1 with a console 11. The console 11 is rigidly connected to the lid 2 of the oven 1 and used to determine the position of the container 4 carried out with the sample 5 during the work process relative to the stand 10 displaceable and fixable The device further includes a device

12 for the supply of gaseous catalyst into the 'space 9 between the electrodes 7 and 8, which acts as a pipeline 13 is designed, which is in communication with a vessel 14 for gaseous catalyst, which is in the Support body 15 of the device is arranged.

The furnace 1 consists of a body 16, inside which a tube 17 is housed, which the function of the shaft of the furnace 1 met. Between the body 16 and the tube 17 is a heating element 18 with a Spiral 19 arranged.

The container 4 consists of a sleeve 20 with a removable bottom 21 in which openings 22 are made are. At the top, the sleeve 20 is closed by a cover 23, in which through a bore 24 the Electrodes 7 and 8 are passed through.

The container 4 rests on the table 3, which is composed of a support 25 and a floor 26, which is designed in the form of a ring with a beaded rim 27.

The electrodes 7 and S are inserted through a hole 28 made in the cover 2 of the furnace 1 and are supported on the cover with a limiter 29 of the immersion depth, which is attached to the electrode 7. The electrodes 7 and 8 are fastened in a holder 30 which has a handle 31. Electrical wires 32 are connected to electrodes 7 and 8.

The fixation of the console 11 and displacement of the same relative to the stand 10 for the precise setting of the table 3 with the container 4 in the shaft of the furnace 1 thanks to a socket 33 rigidly connected to the console 11 with a handle 34 and a locking device 35 made possible, which is located in a groove 36 with a rectangular cross section, which is incorporated in the wall of the guide stand 10.

The interior 38 of the furnace 1 is provided with a suction ventilation system (not shown in the figures) Compound that removes the gaseous catalyst from the facility

According to the invention, the guide stand 10 is hollow, and in its cavity 39 (FIG. 2) is the Pipeline 13 housed. Electrical wires 40 are also accommodated in the cavity 39 of the stand 10, which the electrodes 7 and 8 with the measuring circuit to measure electrophysical parameters between these electrodes. At the ends the pipeline 13 are nozzles 41 and 42 (Fig. 2) attached, which in the wall 37 of the stand 10 in the upper and lower parts of which are attached. Here, the pipeline 13 is by means of the connector 41 with the Hermetically sealed space 9 connected between the electrodes 7 and 8, while by means of the connector 42 the Pipeline 13 by means of a control valve 43 with the container 14 for gaseous catalyst in connection stands.

The connection of the pipeline 13 with the hermetically sealed space 9 is with the help of a flexible hose 44 produced, which is connected to a nozzle 45 in the electrode 7 for the connection of the hose 44 is attached to the space 9

The connector 42 is connected to a connector 47 of the valve 43 by means of a hose 46, and a Connection 48 of the valve 43 is connected to the connection 50 of the container 14 for gaseous catalyst via a hose 49 tied together.

The control valve 43 is with the Meüsdialtung to Measurement of electrophysical parameters electrically coupled between electrodes 7 and 8.

The electric wires 40 accommodated in the cavity 39 of the guide stand 10 are connected to the electrodes 7 and 8 connected via the electrical wires 32 and to the measuring sonic circuit for measuring electrophysical Parameters connected via a limit switch 51 which is attached to the guide stand 10 and cooperates with the console 11 when the latter is moved relative to the stand 10.

The limit switch 51 is mounted in a housing 52 which is fastened to the guide stand 10. The interaction the limit switch 51 with the console 11 comes about by means of a rod 53 which is attached to the Bracket 11 is attached and pushed through an opening 54 in housing 52.

The electric wires 40 accommodated in the cavity 39 of the stand 10 are connected to the electric wires 32 connected by means of a plug-in device 55, the bushing 56 of which is attached to the guide stand 10 and the connector 57 of which is connected to the wires 32.

In Fig. 3 shows a variant of the device.

those for the hardening of binders and core compounds by a liquid vaporizable catalyst, for example triethylamine. is applied.

In this case, the guide stand is in the cavity 58 59 a device 60 for metering liquid catalyst arranged with a vessel 61 for liquid catalyst is hydraulically connected.

The hydraulic connection between the device 60 and the vessel 61 is in the form of a pipeline 62.
4 shows a device 60 for metering liquid catalyst which contains a cylinder 63, in the interior 64 of which a piston 65 with a piston rod 66 is housed, which is moved by an individual drive 67. The cylinder 63 is arranged in the cavity 58 of the guide stand 59 to form a hermetically sealed cavity 68 which is connected via a connector 69 and a pipe 70 to a source for carrier gas supply (not shown in the figures), via a connector 71 and a hose 72, however, is connected to the hermetically sealed space 9 between the electrodes 7 and 8. A control valve 73 is arranged between the nozzle 69 and the cW pipeline 70, which controls the supply of carrier gas into the metering device 60 and is electrically coupled to the measuring circuit for measuring electrophysical parameters between the electrodes 7 and 8. In the hermetically sealed cavity 68 formed by the cylinder 63 in the guide stand 59 is a means 74 for converting the dose of the liquid catalyst, which is supplied from the cylinder 63, into the gaseous state for further transport of the vaporized catalyst into the hermetically sealed space by means of carrier gas 9 between the electrodes 7 and 8 present. The cylinder 63 is designed so that it is alternately connected either to the vessel 61 for liquid catalyst or to the means 74 for converting the dose of the liquid catalyst into the gaseous state.

The device 60 for metering liquid catalyst also contains a micrometer screw 75 with head 76, which the stroke of the piston 65 with the Piston rod 66 limited.

The alternating connection of the interior space 64 of the cylinder 63 with the vessel 61 for liquid catalyst

* r. Sator and the hermetically sealed cavity 68 is accomplished with the aid of check valves 77 and 78, respectively

The hermetically sealed cavity 68 is o'üen through

a partition 79 and delimited at the bottom by a partition 80 , soft partition walls are attached to the wall 81 of the stand 59.

In the partition 80 there is a recess 82 which fulfills the function of the means 74 for converting the dose of the liquid catalyst into the gaseous state.

In the hermetically sealed cavity 68 , a heating element 83 is arranged, which ensures an intensification of the process of converting the dose of the liquid catalyst into the gaseous state.

In the micrometer screw 75 and in the head 76 a bore 84 is made, through which the piston rod 66 is guided, which has an annular projection 85 which is supported against the end face 86 of the micrometer screw 75 when the piston rod 66 moves in the axial direction.

In the cavity 58 of the guide stand 59 electrical wires 87 are accommodated, which are connected to the electrodes 7 and 8 via electrical wires SS and are connected to the measuring circuit for measuring electrophysical parameters via a limit switch 89 which is mounted in a housing 90 attached to the guide stand 59 is. The limit switch 89 interacts with the console 91 when the latter is moved relative to the stand 59. The interaction of the limit switch 89 with the console 91 comes about by means of a rod 92 which is attached to the console 91 and inserted through an opening (not shown in the figures) in the housing 90.

The console 91 is rigidly connected to the cover 2 of the furnace 1.

The fixation of the console 91 and displacement of the same relative to the stand 59 for precise adjustment of the table 3 with the container 4 in the shaft of the furnace 1 thanks to a socket 93 rigidly connected to the console 91 , which has a handle 94 , and a

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Kigem cross-section 15 is located, which is incorporated in the wall 81 of the guide stand 59. The vessel 61 for liquid catalyst is attached to cantilever arms 97 in a housing 98 which is mounted on a base plate 99 which has adjustable supports 100 .

On the same base plate 99 , the furnace 1 (not shown to a limited extent in FIG. 3) and the guide stand are mounted.

The electrical wires 87 are connected to the wires 88 connected to the electrodes 7 and 8 via a plug-in device 101, which consists of a socket 102 and a plug 103.

The partition wall 79 represents the bottom of a sleeve in which a bushing 105 is attached, which has a threaded connection 106 with the micrometer screw 75 . On the outside of the sleeve 104 (not shown in FIG. 4) graduations are applied which allow the size of the dose of the liquid catalyst to be determined. The housing of the device 60 for metering liquid catalyst is a cylindrical tube 107 which is fastened between the partition walls 79 and 80. A tube 108 runs through the hermetically sealed 68 cavity, inside which the electrical wires 87 are accommodated, which are connected to the Socket 102 of the plug device 101 are connected. Thanks to this construction, the escape of the vaporized catalyst is removed from the hermetically sealed cavity 68 prevents the check valve 78 communicates with the recess 82 by means of a duct 109 connected to what the splashing of the liquid catalyst during its feed from the interior 64 of the cylinder 63 in the Recess 82 prevents. The drive 67 illustrates two nuts 1 tenth the I mil Ulfe a thread Ul to the piston rod 66 of the piston 65 are mounted.

In this variant of the device, the function of the device 12 for the supply of gaseous catalyst is performed by the connection piece 71, the pipeline 70 and the connection piece 69.

FIG. 5 shows a variant of the device 60 for metering liquid catalyst, which is arranged in the cavity 58 of the guide stand 59 and is hydraulically connected to the vessel 61 for liquid catalyst. The guide stand 59 is set up on the base plate 99 , which has adjustable supports 100 . The device 60 contains a cylinder 112, in the interior 113 of which a piston 114 with a piston rod 115 is housed, which is moved by a single cylinder 116. The cylinder 112 Ut is arranged in the cavity 58 of the guide stand 59 to form a hermetically sealed cavity 117 which is connected to a carrier gas source (not shown in the figures) via a connector 118 and a pipe 119 , but via a connector 120 and a hose 121 with the hermetically sealed space 9 between the electrodes 7 and 8 in communication.

A control valve 122 is arranged between the connecting piece 118 and the pipeline 119 that supplies the carrier gas to the metering device 60 and is electrically coupled to the measuring circuit for measuring electrophysical parameters between the electrodes 7 and 8.

In the hermetically sealed cavity 117 there is a means 123 for converting the dose of the liquid catalyst, which is supplied from the cylinder 112 , into the gaseous state for further transport with carrier gas into the hermetically sealed space 9 between the electrodes 7 and 8.

The cylinder 112 is designed so that it is alternately connected either to the vessel 61 for liquid catalyst or to the means 123 for converting the dose of the liquid catalyst into the gaseous state.

The device 60 for the dosage of liquid catalyst also contains a micrometer screw 124 to head 125, which limits the stroke of the piston 114 with the piston rod 1 15 °.

The alternating connection of the interior of the cylinder 112 with the vessel 61 for liquid catalyst and the hermetically sealed cavity 117 is in each case accomplished with the aid of check valves 126 and.

The hermetically sealed cavity 117 is delimited at the top by a partition 128 and at the bottom by a partition 129 , which partition walls are attached to the wall of the stand 59. In the partition 129 , a recess 130 is made which fulfills the function of the means 123 for converting the dose of the liquid catalyst into the gaseous state

A heating element 131 is arranged in the hermetically sealed cavity 117 , which ensures an intensification of the conversion of the dose of the liquid catalyst into the gaseous state

The drive 116 of the piston rod 115 with the piston 114 is designed in the form of an electromagnet 132 arranged in the cavity 58 of the stand

Core Ί33 is connected to the piston rod 115 and has a spring 134 which presses the piston 114 against the bottom 135 of the cylinder 112.

The spring 134 is supported against an annular projection 136 formed on the core 133.

The micrometer screw 124 with head 125 acts during its stroke on the cylinder 112 and moves the the latter in the axial direction. This shift comes thanks to the presence of an articulated joint 137 between the end face of the screw 124 and the bottom 135 of the cylinder 112 is executed. One is used to feed the liquid catalyst into the interior 113 of the cylinder 112 Pipeline 138 which is connected to the vessel 61 and to the interior 113 via a hose 139. a pipe 140 and the check valve 126 are connected. For feeding the dose of the catalyst in the means 123 is the interior 113 with the cavity 117 via the check valve 127. a pipe 141. a hose 142 and a tube 143 in communication. The housed in the cavity 58 of the stand 59 electrical Wires 144 are connected to electrodes 7 and 8 via a plug-in device 145 Wires 88 connected. A threaded connection is used to move the micrometer screw 124 146. the nut fastened in the guide stand 59 147 is executed.

In this variant of the facility fulfill the function of the device 12 for the supply of gaseous catalyst, the nozzle 120, the pipeline 119 and the nozzle 118.

In Fig. 6 is a further embodiment of the Device for determining the hardening time of binders and core compounds shown.

The device for determining the hardening time consists of a housing 148 in which there is a heating furnace 149 is located, which consists of a body 150 in which a tube 151 is arranged. that's the function of the Otenschachtes fulfilled. The tube 151 is with respect to the body 150 by means of a bottom 152 and a support 153 fixed, which is made of a heat insulating material, for example asbestos cement outside there is a heating element 154 on the pipe 151 arranged. Between the body 150 and the heating element 154 a thermal insulation 155 is accommodated. There are openings in the bottom 152 of the body 150 present, in which a nozzle 156 is attached, which is connected via a hose 157 to a suction ventilation system (shown in Figures flour). The temperature in the furnace shaft is adjusted with the aid of a thermopodjr and an adjustment potentiometer (both in Figures not shown regulated.

At the top, the furnace 149 has a cover 158 sealed with a heat insulating material, which . In a console 159 is attached. Down is on Dcl kei 158 nvt help of two supports 160 a table 161 attached. - On the table 161 is a cylindrical container 162 put on with a sample 163 to be examined The container 162 has a removable bottom 164 in which openings 165 for the gas discharge the container 162 are executed. At the top of the container 162 is closed by a lid 166, the one Container 162 from the outside comprehensive collar 167 and located inside the container 162 annular Has projection 168 which has a bore in which an outer measuring electrode 169 is arranged which is fixed with respect to the cover 166 by means of a screw 170. Inside the electrode 169 is a second measuring electrode 171 housed. The measuring electrodes 169 and 171 hereinafter referred to as electrodes are connected by a holder 172, the one Handle 173 owns. At the measuring electrode 169 is a Limiter 174 attached to the diving depth, which is relative is axially displaceable and fixable to the electrode 169.

In the measuring electrode 169 is a nozzle 175 for the supply of the catalyst in the hermetically sealed There is a cavity 176 between the electrodes 169 and 171. A hose 177 is attached to the connecting piece 175 connected.

The measuring electrodes 169 and 171 are connected to the measuring circuit for measuring electrophysical parameters connected by means of wires 178 and a connector 179.

The console 159 is attached to a guide stand 180 which is hollow and in its cavity 181 a device 182 for metering liquid catalyst is arranged. those via a pipeline 183 and a hose 184 with a vessel 185 for liquid catalyst is hydraulically connected and contains a cylinder 186, in the interior 187 of a Piston 188 with piston rod 189 are housed.

The piston 188 is moved by an individual drive 190 (FIG. 6.7).

The cylinder 186 is in the cavity 181 of the guide stand 180 to form a hermetically sealed cavity 191 arranged, which via a pipeline 192, a connector 193. a flexible hose 194 and a control valve 195 with a (not shown in the figures) Carrier gas source is in communication, via a connection 1%, a hose 197. a connection 198 and the Hose 177 but with the hermetically sealed space 176 between the electrodes 169 and 171 in connection is set.

The control valve 195 is connected to the measuring circuit for measuring electrophysical parameters (it is not shown in figures) electrically coupled between electrodes 169 and 171.

In the hermetically sealed cavity 191 is a means 199 for transferring the dose of the liquid catalyst, which is supplied as the cylinder 186, in the gaseous state for further conveyance with Carrier gas is provided in the hermetically sealed space 176 between the electrodes 169 and 171.

The hermetically sealed cavity 191 is delimited at the bottom by a partition wall 200 which is attached to the wall 201 of the guide stand 180 is attached. The cylinder 186 is through a bore 202 in the partition wall 200 guided, which can rotate with respect to the partition wall 200.

In the cylinder 186, a channel 203 is executed, which with a channel 204 is in communication, which is carried out in the partition wall 200 and with the pipeline 183 connected is.

Another channel 205 made in the partition wall 200 and connected to a recess 206 is, which is also carried out in the partition wall 200 and dis function of the means of transfer the dose of the liquid catalyst met in the gaseous state, is arranged so that it is at the Rotation of the cylinder 186 through the angle of 180 ° with the channel 203 is brought into connection.

h5 Such a construction enables the alternating Connection of the interior 187 of the cylinder 186 either with the vessel 185 for liquid catalyst or with the means 199 for transferring the dose of

liquid catalyst in the liquid state

The device 182 for metering liquid catalyst also contains a micrometer screw 207 with head 208, which limits the stroke of piston 188 with piston rod 189.

The hermetically sealed cavity 191 is delimited at the top by rim wall 209. through their bore 210 the cylinder 186 is guided isl. The front wall 209 is on the wall 201 of the guide stand 180 attached. in the Hermetically sealed cavity 191 is also a heating element 211, which is used to intensify the transfer the dose of the liquid catalyst in the gaseous state is determined

In the micrometer screw 207 and the micrometer head 208, a bore 212 is made through which the piston rod 189 of the piston 188 is passed through. There is an annular projection on the piston rod 189 213 present, which is against the face 214 of the micrometer screw 207 during the movement of the Piston rod 189 is supported

The cylinder 186 is threadedly connected 215 rigidly attached to a handle 216, which in turn is connected to the console 159, which on Guide stand 180 is rotatably mounted with respect to the latter. In the wall 201 of the guide stand 180 is an annular groove in which a locking device 217 fastened in the console 159 is located

Such a construction ensures a rigid connection of the cylinder 186 with the bracket 159 and enables axial rotation and fixation of the cylinder 186 when the bracket 159 is displaced relative to the guide stand X80, thereby alternating connection of the cylinder 186 with the vessel 185 for liquid catalyst and the agent 199 is guaranteed to convert the dose of the liquid catalyst into the gaseous state.

The guide stand 180 is designed to be movable and has the possibility of axial displacement along the Oven 149 and the fixation in relation to this and is provided with a counterweight 218 (Fig. 6), which the mass of the stand 180 with the console 159 and that of the cover 158 together with the table 161 attached to it with the container 162 placed on this and receiving the sample 163 to be examined, as well as with the im Cover 158 arranged electrodes 169 and 171 compensates.

The axial displaceability of the stand 180 is made rigid by means of an over the housing 148 with the furnace 149 connected cylindrical bush 219 ensures in the ciiis luhrungsstativ 180 is arranged.

In the wall 201 of the guide stand 180 is a Longitudinal groove 220 incorporated, at the upper and lower ends of which depressions 221 are present. In the socket A locking device 222 is attached to 219, the end of which is located in the groove 220 (FIG. 7).

This will fix the guide stand 180 in the upper and lower setting. The lock 222 allows it. if necessary the tripod 180 with respect to the oven 149 in any intermediate position / u

The locking device 222 prevents the tripod 180 from rotating about its axis, because this prevents the hoses 184 and 194 can be damaged.

In the cavity 181 of the guide stand 180 electrical wires 223 are accommodated, which are connected to the wires 178 via the plug device 179 consisting of a socket 224 and a plug 225 and via a limit switch 226 (FIG. 6) to the measuring circuit for measuring are electrophysical p _ara melem eye 169 and 171 between the electrodes closed. The limit switch 226 is arranged so that the guide stand 180 interacts with it when it is moved.

The interaction takes place with the aid of a lever 227 which rotates relative to a support 228. The lever 227 is connected to the housing 148 by means of a spring 229.

ίο The counterweight 218 is on the floor 230 of the tripod 180 fastened with the aid of a rope 231 which is laid over a pulley 232 which is attached to the housing 148 with the aid a cantilever 233 is attached

The cylinder 186 has an end pin 234 <5 (FIG. 7) on which a disk 235, a spring 236, a Washer 237 and a nut 238 are attached. Thanks to such a design, the axial longitudinal displacement of the cylinder 186 prevented and his <. axial rotation is enabled Escape of the gaseous catalyst from the hermetically sealed cavity 191 is prevented.

To ensure the tightness of the cavity 191, the wires 223 run through the same inside a pipe 238a which is hermetically connected to the partition walls 200 and 209

To allow rotation of the handle 216 about the axis and damage the hose 198 and To prevent the wire 223, a cavity 239 is provided in the handle 216, in which the aforementioned Hose and the wires mentioned are housed. The single drive 190 is in the form of nuts 240 which are connected to the piston rod 189 by means of a threaded connection 241.

The micrometer screw 207 is by means of a threaded connection 242 is connected to a sleeve 243 which is rigidly fastened in the handle 216. Outside are at the Sleeve (not shown in the figures) graduations for determining the dose size of the liquid catalyst available.

In this variant of the device fulfill the function of the device 12 for the supply of gaseous Catalyst in the space 176 between the electrodes 169 and 171 of the connector 198. the hose 197. the Nozzle 196. the pipeline 192, the nozzle 193 and the hose 194. which are connected to the control valve 195 is.

The in Fig.! and 2 shown device for determination the maintenance period of core masses works in the following way. You turn on the heating of the Oven 1 and sets the specified temperature. If necessary, the hardening of core materials To examine the room temperature, the heating is not switched on. Then you fill the sleeve 20 together the bottom 21 arranged in this with an initial weight of the core mass to be examined and closes them up through the cover 23. Thereafter, the handle 34 is pushed upwards along the guide stand 10. turns around the latter and lowers downwards. This shifts together with the handle 34 the socket 33 with the locking device 35. the console 11 with the rod 53 and the cover 2 rigidly connected to the console with the table 3. The movement path of all elements mentioned is dependent on the configuration of the groove 36 incorporated in the wall 37 of the stand 10 certainly. Thanks to the ll-shaped shape of the groove 36 is the table 3 is moved out of the furnace 1 and placed on the support body 15 of the device. After that, the assembled container 4 on the bottom 26 of the

Table 3 placed on top Here, the flanged edge 27 secures the container 4 against displacement relative to the floor 26. Through the holes 28 in the ceiling! 2 and 24 in the cover 23, the electrodes 7 and 8 are inserted through it. Then the cover 23 is pushed down as far as it will go, thereby compressing the initial weight of the core mass and transforms this into the sample 5 to be examined. Thereafter, the electrodes 7 and are displaced 8 down to the stop, filling the space between them with the core mass.

The depth of the immersion of the electrodes in the sample 5 to be examined is determined by the position of the limiter 29 of the immersion depth in relation to the electrode 7 is determined.

Then you insert the plug 57 of the plug device 55 into the socket 56, whereby the connection of electrodes 7 and 8 with the measuring circuit for measuring electrophysical parameters manufactures

Then one connects by means of the hose 44 the nozzle 41 and 45 and switches the measuring circuit to Measurement of electrophysical parameters.

Because the limit switch 51 is switched off at this moment, there is no registration of the electrophysical parameters between the electrodes 7 and 8 instead. This is the preparation of the device on the job completed.

The handle 34 is pushed upwards and rotated in the opposite direction around the guide stand 10 and lowers to unien. Here, together with the handle, the bushing 33 and the locking device 35 move, the console 11 with the cover 2 attached to the diei.r of the furnace 1, the table 3, the container 4 including the sample to be examined 5 and with .en electrodes 7 and 8th.

Thanks to the existing groove 36, along which the locking device 35 is displaced, the table 3 enters exactly the tube 17, and the lid 2 closes the furnace 1 from above by being supported on this and the Hermetically seals the interior space 38 of the furnace. The socket 33 is fixed in relation to the guide stand 10 in the lower end position. This will accidental opening of the interior 38 is prevented.

At the same time, the switch attached to the console 11 switches Rod 53 the limit switch 51. which is located in the housing 52.

When the limit switch 51 is switched on, the measuring circuit the measuring circuit for measuring electrophysical parameters closed, and the recording device begins to measure the parameter to be controlled.

Simultaneously with the closing of the measuring circuit, the control valve 43 is opened and the exhaust ventilation is switched on, which ensures the removal of the gaseous catalyst from the interior 38.

When the control valve 43 is opened, it enters the vessel 14 pressurized gaseous catalyst via the connection 50, the hose 49, the connection 48, the valve 43. the nozzle 47, the hose 46 and the Connection 42 into the pipeline 13 and flows from there via the connection 41, the hose 44 and the connection 45 into the hermetically sealed space 9 between the electrodes 7 and 8.

The catalyst passes from the hermetically sealed space 9 thanks to the increased pressure, the core mass, which is in the space /. between the electrodes 7 and 8, and exits through the openings 22 in the base 21 into the interior space 38 of the furnace, from which it enters the exhaust ventilation system Will get removed.

When the gaseous catalyst interacts with the binder, the latter hardens, which leads to the hardening of the sample to be examined

In this way, core masses prepared on the basis of liquid water glass harden when carbon dioxide gas is _{blown through them (CO 2} process).

ίο Change depending on the hardening of the binding agent its electrophysical properties (electrical conductivity and electromotive Force that arises when the core mass comes into contact with the electrodes made of different metals), considerably.

The size of the initial electrophysical properties of the core mass is determined by its binder content and determined by the physico-chemical properties of the same.

In connection with the fact that the only electrically conductive component in the core mass is the binder is, the electrical conductivity of the core mass is only determined by the electrical conductivity of the binder certainly.

As the binder hardens, the electrical conductivity of the core mass decreases and reaches its minimum when completely hardened.

Similar to the electrical conductivity, the electromotive force (EMF) also changes.

The hardening strength of the sample 5 to be examined is determined by the time interval between the instant the timing of the supply of the gaseous catalyst and the moment when the minimum is reached the electrical conductivity is determined. This interval is recorded by the recorder.

After the hardening process has ended, the measuring circuit for measuring electrophysicals is switched on Parameters. Here, the control valve 43 stops with the supply of the gaseous catalyst the hermetically sealed space 9 between the electrodes 7 and 8. The locking device 35 is released the handle 34 upwards and after it has been rotated around the guide stand 10, it is lowered downwards. Here the table 3 is supported on the support body 15 of the device outside the furnace 1. Then you separate the hose 44 from the nozzle 45 and pulls the plug 57 of the plug device from the socket 56 the end. The electrodes 7 and 8 are moved upwards on the handle 31 relative to the covers 2 and 23.

Then take the Beha, .jr4 from table 3 and pulls the hardened sample 5 out of it. The electrode 7 is separated from the holder 30 and pulled out of it Cavity 9 out the hardened core mass, whereupon the device can be used for further measurements can.

The synchronous switching on of the supply of the gaseous catalyst and the measuring circuit allows the investigation of hardening processes of nuclear masses brought about by gaseous catalysts are curable and have a high curing rate. The facility ensures a Safe work, especially when using toxic catalysts, high accuracy and Rcprodu / .icrbiirkcit of the measurement results. The arrangement

b.i iiung of the limit switch 51 inside the housing 52 and its switching by means of cIlm · on the console 11 fixed rod 53! not just synchronism at the /.iifiihninji of the gaseous catalyst

and the activation of the measuring circuit, but prevented also a random response resulting in leakage of the toxic catalyst into the work zone can lead.

If desired, the facility allows the hardening time to determine not only a sample of the core mass, but also a finished core under the operating conditions. In this case one proceeds in the following way. The handle 34 is pushed upwards, rotated with respect to the guide stand and lowers the table 3 on the support body 15 of the device away. The electrodes 7 and 8 are then connected to the nozzle via the nozzle 45 by means of the hose 44 41. The length of the hose 44 will depend on the distance between the device and the one to be cured Core selected The plug 57 of the plug device 55 is inserted into the socket 56. The limiter 29 de ·· The immersion depth is shifted relative to the electrode 7 and sets the required depth of immersion of the electrode in the core.

Then you take the electrodes 7 and 8 fastened in the holder 30 on the handle 31 and immerse them in them the core to be examined until the limiter 29 of the immersion depth rests on the surface of the core

Then move the handle 34 upwards, rotate it around the guide stand 10 and lower the table 3 into the shaft of furnace 1. Here, the rod 53 switches on the limit switch 51, whereby the feed of the gaseous catalyst in the hermetically sealed space 9 of the electrodes 7 and 8, which are in the the core located outside the device are immersed, and the simultaneous activation of the recorder he follows

The hardening time is determined in the same way as in the case of the examination of sample 5 of the core mass.

If desired, the device can also be used to determine the hardening time at thermal Drying hardenable core masses can be used.

All operations are carried out in the same order as in the case of curing the sample with the help of a gaseous catalyst.

The difference is that you have the nozzle 45 and 41 does not connect by means of the hose 44 and the activation of the control valve 43 is blocked.

The hardening of the sample 5 to be examined takes place due to their heating to a predetermined temperature, whereby the hardening of the binding agent takes place.

Here you change ¹ ! the electrophysical parameters as well as this when the core mass is hardened by a gaseous one. Catalyst is the case.

The device can also be used to determine the hardening time of cold-hardening compounds (KHM) insert. In this case, the same sequence of operations is maintained as when determining the Hardening time of core masses hardenable by thermal drying.

The only difference is that you can use the furnace 1 when examining cold-curing compounds does not turn on.

If it is necessary to determine the hardening time of the binding agent, before starting work on the Bottom 21 a hermetic insert (not shown in figures) is arranged to prevent the liquid from running out Binder from egg container 4 prevented. The binder to be examined is then placed in the container 4 and carries out all operations in the order given above.

The construction of the facility enables the investigation of binders that are curable by blowing a gaseous catalyst through them, as well as of binders which can be hardened by thermal drying or cold curing.

The in F i g. 3 and 4 shown variant of the device for determining the hardening time of core masses is used to determine the hardening time of core masses that pre-evaporated when blown through with a liquid catalyst are curable

One such process is in the curing of isocyanate binders recorded by triethylamine.

The facility works as follows.

As with the one in FIG. 1 variant of the device shown is the container 4 with the examining sample 5 on the outside of the shaft of the furnace 1 table 3.

The electrodes 7 and 8 are immersed in the sample 5 to be examined, whereupon the plug 13 of the Sieckvorricruut'g 101 connected by the electrical wires 88 to the electrodes 7 and 8 is inserted into the socket 102 of the hose 72 with the connector 71.

The liquid catalyst is then metered in. To do this, move the nuts 110 down to the Stop, and the piston 65 assumes the lower end position. By rotating the micrometer head 76 and the micrometer screw 75 is used to set the required dose size of the liquid catalyst. Brings to it a mark on the micrometer head 76 with the desired pitch (not shown in the figures) on the Sleeve 104 in accordance. Here, the end face 86 of the micrometer screw is displaced by one Amount up. The nuts 110 are moved together with the piston rod 66 upwards, the annular projection 85 of the piston rod 66 on the End face 86 of micrometer screw 75 rests. The piston 65 also moves upwards in the process, in the interior 64 of the cylinder 63, a negative pressure is generated under the piston 65, whereby the check valve 78 is closed and the check valve 77 is opened. The closing of the check valve 78 prevents the entry of air from the hermetically sealed cavity 68 into the space 64 under the piston 65.

The liquid catalyst flows so long from the vessel 61 via the pipe 62 into the space 64 of the Cylinder 63 under the piston 65 until it completely fills it.

The size of the dose of liquid catalyst located under piston 65 is determined by the size of the movement of the piston is determined by the position of the end face 86 of the micrometer screw 75 », vird.

After the space 64 under the piston 65 has been filled with the liquid catalyst, the Nuts 110 together with the piston rod 66 and the piston 65 down to the stop.

Here, the check valve 77 closes by it thereby prevents the metered dose from flowing back into the vessel 61. However, the valve 78 opens, and the measured dose of the liquid catalyst reaches the recess 62 via the tube 109.

If necessary, the process of converting the liquid catalyst into the gaseous state intensify, the heating element 83 is initially switched on.

The measuring circuit is sounded to measure

electrophysical parameters between the electrodes 7 and 8 a.

When the metering of the liquid catalyst has ended, the handle 94 is pushed upwards and then lowered it has been rotated around the guide stand 59, downwards. The bush 91 moves together with the locking device 95. the console 91 and the rod 92 attached to it and also to it attached lid 2 of the furnace 1 together with the table 3, the container 4 with the sample 5 to be examined, the electrodes 7 and 8 along a path which is determined by the shape of the groove 96. This is the table 3 with the Container 4 is exactly lowered into the tube 17, and the lid 2 closes the furnace 1. The socket 93 is in fixed with respect to the guide stand 59, and thereby accidental opening of the lid 2 of the furnace 1 prevented.

nipi.-hvpititj thus the rod 92 receives the limit switch 89 mounted in the housing 90. Switching on the limit switch 89 closes the measuring circuit and the control valve 73 responds. The recorder begins to record the size of the electrophysical parameters (the electrical conductivity or the EMF). and it starts the inflow of the carrier gas from a source for carrier gas supply via the nozzle 69, the control valve 73 and the conduit 70 into the device 60 for metering liquid catalyst.

Compressed air, nitrogen or any other inert gas can be used as the carrier gas. The carrier gas flows into the device 60 for metering liquid catalyst via the pipeline 70 and reaches the Well 82 in which a metered dose of the liquid catalyst is located. The carrier gas will bubbled through the liquid catalyst and vaporizes it intensively. The vapors of the liquid catalyst are distributed in the hermetically sealed cavity 68, thereby averaging and balancing the Concentration takes place, and are then hermetically sealed with carrier gas via the nozzle 71 and the hose 72 sealed space 9 between the electrodes 7 and 8 conveyed.

The vapors of the catalyst with the binder of the core material located inside the electrode 7 work together, cause their hardening, which is caused by a reduction in electrical conductivity and the EMK is accompanied. The complete hardening of the core mass corresponds to the minimum of electrophysical parameters.

After the hardening process has ended, the locking device 95 is moved aside and the handle 94 is moved upwards and then lowers the table 3 onto the base plate 99 outside the furnace 1. Here the Limit switch 89 switched off, the registration of the electrophysical parameters between the electrodes 7 and 8 cease and the control valve 73 interrupts the supply of the carrier gas to the device 60 for dosing liquid catalyst.

A variant of the device for metering liquid catalyst, shown in Figure 5, is used for Use in the in F i g. 3 variant of the device for determining the hardening time of Core masses.

The device for dosing liquid catalyst works in the following way. The micrometer head 125 is rotated around the guide stand 59. Here, the micrometer screw 124 moves thanks to the threaded connection 146 relative / ur nut 147. The articulated connection 137 ensures the axial displacement of the cylinder 112 without rotating the same about the longitudinal axis, which can damage the hoses 139 and 142 could lead.

The switching off of the limit switch 89, which takes place when the table 3 is pulled out of the oven 1, is accompanied by the activation of the electromagnet 132, whereby the core 133 moves downwards and the piston rod 115 connected to it, along with it

ίο Piston 114 moves.

This is located in the piston 114 located above Space 113 of the cylinder 112 generates a negative pressure, the check valve 127 closes and the check valve 126 opens. The liquid catalyst comes out of the vessel 61 via the pipe 138, the hose 139, the tube 140 and the check valve 126 into the space 113 above the piston 114.

The size of the dose of the liquid catalyst is determined by the displacement of the bottom 135 of the cylinder 112 is determined relative to the lower end position of the piston 114, d. i.e., the higher the micrometer screw 124 the bottom 135 of the cylinder 112 moves, the greater is the dose of catalyst located in space 113 above piston 114.

After placing of the container 4 with the sample 5 to the table 3 and the insertion of the electrodes 7 and 8 in the ^D robe to the electric wires 88 connects on the plug-in device 145 with the wires 144 while the neck 120 by means of the tube 121 connects to the connecting piece 45.

Then, by means of the handle 94, the table 3 with the container 4, the sample 5 and 5 to be examined is brought the electrodes 7 and 8 in the furnace 1. After the furnace 1 is closed by the cover 2, the Limit switch 89 switched on. The following happens here: the measuring circuit of the measuring circuit is used for the measurement of electrophysical parameters switched on and the electromagnet 132 switched off, whereby the spring 134 pushes the core 133 and the piston rod 115 connected to it with the piston 114 upwards. In the Upward movement of piston 114 finds closure of the check valve 126 and the opening of the check valve 127 instead. As a result, the metered dose of the catalyst via the check valve 127, tube 141, hose 142, and tube 143 into recess 130.

At the same time, the control valve opens 122 and the supply of the carrier gas via the nozzle 118, the valve 122, the pipeline 119 into the Hermetically sealed cavity 117. As a result of the supply of day gas the dose of the liquid catalyst is evaporated and by means of carrier gas via the nozzle 120, the Hose 121 and the connector 41 conveyed into the hermetically sealed space 9 between the electrodes 7 and 8. All other operations are carried out in the order given above

It becomes necessary to start the process of converting the liquid catalyst into the gaseous state intensify, the heating element 131 must be switched on before dosing.

The in F i g. 6 and 7 shown variant of the device for determining the hardening time of core masses is also used to determine the hardening time of liquid vaporisable catalysts hardenable core masses.

The device works as follows. You turn on the heating furnace 149 and wait for a predetermined one to be in it Set temperature if necessary

To determine the hardening time of the mass at room temperature, the heating furnace 149 is not switched on. The guide stand 180 is then moved upwards on the handle 216 to the stop. The lock 222 fixes it against displacement in the vertical plane. Together with the tripod 180 move upwards; the console 159 and - attached to it - the cover 158 , ie, supports 160, the table 161, the container 162 with the cover 166 and the base 164 as well as the electrodes 169 and 171, ie the entire movable system. This lowers the counterweight 218 and counterbalances the weight of the moving system.

The electrodes 169 and 171 together with the holder 172 on the handle 173 are pulled out of the lid 166 of the container 162 and the lid 158 of the oven 149 , after the hose 177 has been separated from the connector 198 and the plug 225 is pulled out of the socket 224 Has.

Then you remove the container 162 together with the bottom 164 and the lid 166 from the table 161 , whereupon the locking device 222 is moved aside and the guide stand 180 is moved down to the stop and until it is fixed by means of the locking device 222 in the lower position . The piston 188 of the metering device 182 is supported against the bottom of the cylinder 186 .

The dose of the liquid catalyst to be evaporated is then set by means of the micrometer head 208. To do this, the micrometer head 208 is rotated about its axis, and the micrometer screw 207 interlocks upward relative to the sleeve 243 on the thread 242.

The guide stand 180 in the lower position and the table 161 in the shaft of the furnace 149, the passage 203 of the cylinder is combined 186 with the channel 204 which communicates with the pipeline 183 in compound by means of the tube 185 to the vessel 185 connected for liquid catalyst. Here, the level of the catalyst in the vessel 185 is higher than the position of the channel 203.

When the nuts 240 are moved upwards together with the piston rod 189 and the piston 188 , the interior space 187 of the cylinder 186 is filled with the catalyst via the channel 203. The stroke height of the piston 188 and consequently the volume of the catalyst dose are determined by the position of the end face 214 of the micrometer screw 207 , against which the projection 213 of the piston rod 189 is supported.

After lifting the nuts 240 upwards and filling the cylinder 186 with the catalyst, which takes place as a result of the negative pressure generated by the piston 188 , you move the locking device 222 aside and move the guide stand 180 up to the stop, whereby this in the upper end position is fixed.

Then the locking device 217 is moved aside and the movable system is rotated on the handle 216 around the guide stand 180 by an angle of 180 ° up to the stop and until it is fixed in this position. The cylinder 186 rotates and the channel 203 is connected to the channel 205

On the table 161 it sets the container 162 which is previously filled with the to be assayed sample 163 and covered by the cover 166 through the hole in the lid 158 leads to the electrodes 169 and 171 through which one with respect to the cover 166 of the container 162 is fixed by means of the screw 170. Then, on the handle 173, the holder 172, together with the electrodes 169 and 171 and the cover 166, are pushed down until they stop. Here, the annular projection 168 of the lid 166 compresses the mass in the container 162.

After compaction of the ground loosening the screw 170 and moves the electrodes 169 and 171 down again up to the stop, whereby a post-compression of the mass occurs in the inter-electrode space. The depth of the immersion of the electrodes 169 and 171 in the sample 163 to be examined is determined by the position of the preset limiter 174 of the immersion depth. After the electrodes 169 and 171 have been arranged , the plug 225 is inserted into the socket 224 and the hose 177 is connected to the socket 198 .

Then the vaporizable catalyst is introduced, for which purpose the nuts 240 are pushed down until they stop. In this case, the piston 188 displaces the catalyst from the interior 187 of the cylinder 186 via the communicating channels 203 and 205 into the recess 206. If intensive evaporation of the catalyst is necessary, the heating element 211 is initially switched on.

After the introduction of the catalyst dose, the measuring circuit is switched on and, after the locking device 217 has been moved aside, the handle 216 is turned in the opposite direction as far as it will go. As a result, the movable system assumes such a position that the table 161 is located above the shaft of the furnace 149 and the channel 203 of the cylinder 186 is again in communication with the pipeline 183.

Then you move the guide stand 180 together with the movable system down to the stop and until it is fixed. Here, the cover 158 closes the oven 149 from above, while the base 230 of the guide stand 180 presses on the lever 227 , so that the contacts of the limit switch 226 are closed. The following happens: the STEU valve 195 is opened and the carrier gas (for example air) passes through the hose 194, the nozzle 193 and the pipe 192 into the hermetically sealed cavity 191. There is intensive evaporation of the catalyst and its distribution as a whole Volume of the cavity 191 instead, and then the catalyst vapors are supplied by means of carrier gas via the connection 1%, the hose 197, the connection 198, the hose 177 and the connection 175 to the hermetically sealed space 176 of the electrodes 169 and 171 , whereby they are there Pass the existing mass and cause it to harden.

Switching on the limit switch 226 causes the measuring circuit to be switched on at the same time, and the change in the electrophysical parameters (the EMF and the electrical conductivity), which reach their minimum value when the binding agent hardens completely, is recorded on the strip of the recording device.

The gaseous (or vaporous) catalyst passes through the base 164 with the openings 165 and enters the cavity of the shaft of the furnace 149, from which it is removed into the exhaust ventilation system via the hose 157. The hardening time of the mass is determined by the time interval from the moment the measuring circuit is switched on to the moment when the electrophysical parameter reaches its minimum

After the hardening process has ended, the micrometer head 208 is used to set the

^{25 2β}

required dose, then fills the interior 187 of the cylinder 186 with the catalyst, then leads the Locker 220 aside, turns off the measuring circuit for measuring electrophysical parameters and moves the guide stand 180 upward, after which the electrodes 169 and 171 and the container 162 removed with the hardened mass. The device is then ready for use.

The device according to the invention can also be used to determine the hardening time of masses which can be hardened by gaseous catalysts, for example according to the CO2 process.

In this case, the metering device 182 is not used, and the gas serving as a catalyst is made from a bottle via the valve 195, the hose 194, the nozzle 193, the pipe 192, the nozzle 196, the hose 197, the nozzle 198, the hose 177 and the nozzle 175 directly to the hermetic sealed space 176 of electrodes 169 and 171 supplied. All remaining operations are at work with the device in the order given above (with the exception of the metering of the catalyst) executed.

The device can also be used for the investigation of cold-hardening masses that are in a heated equipment are curable. In this case, all operations are carried out in the specified order executed, but the control valve 195 is not turned off.

30 Commercial usability

The invention can be used with the best success in determining the setting time of electrically conductive Binders and core masses are used, the binders such as liquid water glass or contain high molecular weight synthetic resins, soft when blown through with gaseous or vaporous catalysts are hardenable.

In addition, the invention can be used to determine the hardening time of binders and core compounds which are curable by thermal drying, and can be used by cold-curing compounds.

In addition 6 sheets of drawings

50

55

eo

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Claims (16)

Patent claims: 1. Device for determining the hardening time of binders and core masses that have a A container for a sample to be examined placed in a heating oven with a lid, which is placed on a with the furnace lid rigidly connected table is placed and arranged coaxially in the electrodes are connected to a recorder via a measuring circuit for measuring electrophysical Parameters are electrically coupled between the electrodes, which to form a hermetically sealed space between them are connected, one placed outside the furnace Guide stand with a console, which is rigidly connected to the furnace lid and for precise Adjustment of the table with the container in the oven can be fixed and moved relative to the stand is, and a device for the supply of gaseous catalyst in the hermetically sealed Contains space between the electrodes, one in communication with a vessel for gaseous catalyst has standing pipeline, characterized in that the guide stand (10, 59,180) is hollow in its cavity (39,58,181) the pipeline (13,70,119,192) for the Supply of gaseous catalyst into the hermetically sealed space (9,176) between the electrodes (7 and 8, 169 and 171) and electrical wires (40, 87,144,223; are housed, which are the electrodes (7 and 8, 169 and * 71) mi 'the measuring circuit for Measurement of electro-physical parameters between the electrodes (7 un ^ 8,169 and 171) connect. 2. Device according to claim 1, characterized in that the pipeline (13, 70, 119, 192) with Nozzles (41 and 42, 69 and 71, 118 and 120, 193 and 198) is provided in the wall (37, 81, 201) of the stand (10,58,180) in its upper and lower Part are fastened, the pipeline (13, 70, 119, 192) via the one nozzle (41, 71, 120, 193) is connected to the hermetically sealed space (19, 176) between the electrodes (7 and 8, 169 and 171), while the pipeline (13, 70, 119, 192) via the other nozzle (42,69,118,193) by means of a control valve (43,73,122,195), the one with the measuring circuit is electrically coupled for measuring electrophysical parameters. with the outside of the tripod (10, 59, 180) arranged vessel (14) for gaseous Catalyst communicates. 3. Device according to claim 1, characterized in that that in the cavity (58) of the guide stand (59) a device (60) for metering liquid Catalyst is housed, which is hydraulically connected to a vessel (61) for liquid catalyst is. 4. Device according to claim 3, characterized in that that the device (60) for dosing. ilüsvgem catalyst a cylinder (63) ent- bo holds, which has a piston (65) with a piston rod (66) which is housed in its interior (64) and are movable by a drive (67), and in the I icihlraiim (58) of the guide stand (59) iiiitcr formation of a hermetically sealed cavity b5 (68) is housed. via a nozzle (69) and a pipe (70) with a source of water supply and via a connector (71) with the hermetically sealed space (9) between the electrodes (7 and 8) in connection, in which hermetically sealed cavity a means (74) for transfer the dose of the liquid catalyst fed from the cylinder (63) into the gaseous Condition for further transport with carrier gas into the hermetically sealed space (9) between the electrodes (7 and S) is provided, and the cylinder alternates with either the vessel (61) for liquids Catalyst or with the means (74) for transferring the dose of the liquid catalyst into the gaseous state is put in connection, the device (60) for metering liquid The catalyst contains a micrometer screw (75) with a head (76) which controls the stroke of the piston (65) limited by the piston rod (66). 5. Device according to claim 4, characterized in that the alternating connection of the cylinder (63) with the vessel (61) for liquid catalyst and with the means (74) for transferring the Dose of the liquid catalyst in the gaseous state accomplished by means of check valves (77 and 78) will. 6. Device according to claim 4, characterized in that the hermetically sealed cavity (68) in the guide stand (59) above and below through on the wall (81) dt; Partition walls attached to tripods (59) (79 and 80) is limited. of which the lower one (80) has a recess (82) that performs the function of the Fulfilled by means of converting the dose of the liquid catalyst into the gaseous state. 7. Device according to claim 4, characterized in that that in the hermetically sealed cavity (68) of the guide stand (59) a heating element (83) / ur Intensification of the process of converting the dose of the liquid catalyst into the gaseous one State is arranged. 8. Device according to claim 4, characterized in that in the micromet ·. screw (75) and an axial bore (84) is made in the head (76). through which the piston rod (66) is guided, the has an annular projection (84) which rests against the face (66) of the micrometer screw (75) is supported during the movement of the piston rod (66). 9. Device according to claim 4, characterized in that a drive of a piston rod (115) with piston (114) is designed in the form of a > m cavity (58) of the stand (59) attached electromagnet. whose core (133) is connected to the piston rod (115) and has a spring (143) which presses the piston 114 against the bottom (135) of the associated cylinder (132). 10. Device according to claim 4, characterized in that that the micrometer screw (124) in the head (125) acts on the cylinder (112) during its stroke and moves the latter in the axial direction. 11. Device according to claim 4, characterized in that that a cylinder (186) is rigidly connected to a bracket (159) and during the displacement the console (159) relative to the guide stand an axial rotation and fixation for alternating Connection of the cylinder (186) to a vessel (185) for liquid catalyst and to an agent for converting a dose of the liquid catalyst into the gaseous state. 12. Device according to claim 1, characterized in that that the tripod (180) the possibility of axial displacement along the heating furnace (149) and fixation with respect to the same and with a counterweight (218) is provided. that is the mass of the stand (180) with the console (159). of the lid (158) with the table (161) attached to it. on which the container (162) with the to be examined Sample (163) is attached. and balances with the electrodes (169 and 171) arranged in the cover (158) 13. Device according to claim 12, characterized in that ίο indicates that the axial displacement of the stand (180) by means of a heating furnace (149) rigidly connected cylindrical socket (219) in which the stand (180) is arranged on its outer surface has a longitudinal groove (22Ü), and is ensured by means of a locking device (222) fastened in the socket (219) is, the end of which is in said groove (220) 14. Device according to one of the preceding claims, characterized in that the electric view Wires (223) which are arranged within the guide stand (iöö), with the measuring device for Measurement of electro-physical par. Bidders between electrodes (169 and 171) are connected via a limit switch (226) which is located under the guide stand (180) is attached, and with this during the axial displacement after the guide stand (180) has assumed the lower end position has worked together 15. Device according to one of the preceding Claims, characterized in that the electrical wires (40,87,114,223) which are in the cavity (39, 58, 181) of the guide stand (10, 59, 180) are accommodated, with the measuring circuit for measuring electro-physical parameters between electrodes {7,8; 169,171) via a limit switch (51,89, 226), which is attached to the guide stand (10, 59, 180) and to the console (11,91,159) in its lower position cooperates in the displacement of the latter with respect to the tripod. 16. Device according to claim 1, characterized in that that the electrical wires (40, 87, 144, 223). in the cavity (39, 58, 181) within the Stand (10,59,180) are accommodated with the electrodes (7 and 8, 169 and 171) are connected with the help of a plug device (55,101,145,179) whose Socket (56,102, 224) on the guide stand (10,59,180) is appropriate.